hayward



(No Model.) 2 Sheets-Sheet I.

H. S. HAYWARD.

DASH POT.

No. 262,040. Patented Aug. 1 1882.

WITNESSES;

INVENTOR. QQiJZWj/W H. s. HAYWARD, WM" B Y m 62mm m.

ATTVE.

N EYERS. PhcKo-Ldhogmpher. Washmgion 0. C.

2 Sheets-Sheet 2.

(No Model.)

INVENTORI H. 8. H AYWARD Patented Aug. 1, 1882.

DASH POT.

H. S. HAYWARD.

5 MW W ..W, NUM

1 BY uiflmdb uC).

ATTYS.

UNITED STATES PATENT OFFICE.

HENRY S. HAYWARD, OF JERSEY CITY, NEW JERSEY.

DASH-POT.

SPECIFICATION forming part of Letters Patent No. 262,040, dated August1, 1882.

Application filed May 8, 1882.

To all whom it may concern:

Be it known that I, H. S. HAYWARD, of Jersey City, county of Hudson andState of New Jersey, have invented new and useful Improvements inDash-Pots; and I do hereby declare that the following is a full andexact description of the same, reference being had to the accompanyingdrawings, and to the letters of reference marked thereon.

This invention consists mainly in the combination of the valve portionof a dash-pot with an adjusting device of special construction, adaptedfor use by the engineer to determine the area of opening exposed by thevalve when seated for the passage of the fluid.

It consists,further,in the combination of the main valve for controllingthe flow of the fluid with certain auxiliary valves for disposing of anyexcess of fluid above the normal quantity.

It consists, further, in certain details of construction, which, inconnection with the foregoing, will be fully described hereinafter.

' In the drawings, Figure 1 represents a vertical sectional elevation ofmy improved dashpot; Figs. 2 and 3, enlarged sectional views of theauxiliary valves; and Fig. 4, a top view with the cover removed, andwith a portion cut away on the line 00 :r, Fig. 1.

' To enable others skilled in the art to make my improved dash-pot andto properly use the same, I will proceed to describe fully itsconstruction and manner of operation.

A, Fig. 1, represents a cast-iron receptacle having a body portion, a,of cylindrical form and a base portion, a, of conical form, with asupporting-flange, a as shown.

a a Figs. 1 and 4, represent radial ribs of flanges, extending inwardfrom the receptacle A a proper distance, each of which is provided witha projecting portion, a, as shown.

a represents one wall of an opening extending through the base portionof the dash-pot, the upper portion of which opening is provided withscrew-threads, as shown.

a represents a threaded extension adapted to form, in connection withother parts, 2. stuffing-box in the usual well-known manner.

a. represents a rim extending about the periphery ofthe receptacle atitsupper end,which is provided with a bearin g-shoulder, a adapted (Nomodel.)

to support the sustaining-ring J of the coverplate hereinafter referredto.

B represents an inner vessel,of cylindrical form, which is open above,but closed below, with the exception of a central opening, as shown.This vessel is adapted in size and shape to snugly fit within the radialribs to, its base portion 1) resting upon and being supported by theprojectingportions a as shown.

C, Fig. 4, represents a ring cast as a flange on the inner receptacle,B, and adapted to fill the space between the inner wall of thereceptacle A and the outer wall of the vessel B,which flange or ring isprovided with two or more openings adapted to receive the auxiliaryvalves hereinafter referred to. This ring rests upon the upper endsofthe ribsa and is strongly secured thereto by means of bolts, as shown.

D represents a valve having the bearing portion (1, adapted to controlthe flow of the fluid through the opening in vessel B, the guiding wingsor ribs (1, and the shank or rod (1 as shown.

E represents an adjusting device consisting of a frame portion, 0, and ashank or rod portion, 0, as shown. A

0 represents the base-piece of the frame portion, which has a bearingupon the upper surface of the base portion of the receptacle A when theadjusting device is in its lowest position, as shown in Fig. 1, leavinga certain amount of opening at all times to prevent eugine-valve frombeing kept from its seat by excessive cushioning.

e 0 represent vertical arms rising from the base-piece, which supportanannular cap-piece, 0, having vertical projections 0 as shown.

0 represents a threaded portion at the upper end of the shank or rod 6,and c a handle-wheel at the lower end of the same, by means of which theentire adjusting device may be revolved when desired.

F represents a sleeve or collar surrounding the lower end of the shank(I and united thereto by means of a connecting-pin, as shown.

f represents a spring surrounding the shank W, the lower end of whichbears upon the upper surface of the sleeve F, and the upper end of whichbears against the lower surface of the cap-piece 0 as shown.

G, Fig. 2, represents an auxiliary valve, of any proper construction,supported by a bearing-ring, g, which is itself held in the ring plateor flange U in any proper manner, which valve is adapted to open in anupward direction, as shown. H, Fig. 3, also represents an auxiliaryvalve, of an y proper construction. supported by a bearing-ring, h, thering itself being held in the ring or flange plate 0 in any propermanner, which valve is adapted to open in a downward direction, asshown. The auxiliary valve G is adapted to resist a high pressure-saythat of forty pounds; but-the valve H is adapted to yield under a lowpressuresay that of ten pounds. If desired, two or more valves of eachkind may be employed, and these may be located on opposite sides, asindicated in Fig. 4.

I represents the piston or plunger, provided with the metallic packing1', as shown, which is adapted to move freely in a vertical direc tionwithin the vessel B in the manner well understood.

J represents a ring supported and held by the bearing-shoulder a of thereceptacle A, which ring is provided upon its exterior surface withscrew-threads, as shown.

K represents a cover-plate, of any proper construction, having aninternal threaded portion adapted to engage with the correspond-v ingportion of the ring J, as shown.

The operation is substantially as follows: The general operation of thedash-pot is like others of its class. By the descent of the piston thefluid contained in the vessel B is forced through the valve-openingbelow intothe space upon the outside of the vessel, the resistance ofthe fluid to this displacement serving finally to arrest the movement.By the ascent of the pis ton the fluid is drawn again into the vessel;The special operation of the adjusting mechanism is as follows: When theparts are in the position shown inFig. 1 the base-piece e oftheadjusting device rests upon the upper wall of the base portion of thereceptacle A, so that movement in a downward direction is impossible.Thelower end of the shank or rod al of the valve D rests upon thisbase-piece, and is thus held also from downward movement. From this itfollows that the bearing portion d of the valve is in its lowestposition. Consequently the least requisite area of opening is exposedfor the passage of the fluid. If it is desired to increase the area ofopening when the valve seats it self, the hand-wheel is turned in theproper direction to elevate the base-piece e of the frame portion theproper distance. In consequence of this adjustment the shank of thevalve cannot descend so far, and hence a greater area of opening. willbe exposed by the bearing portion (1. By means of the projections theupward movement of the adjusting device is so limited that thevalve-opening can never be entirely closed by it. When the pistonascends the valve D rises against the ac tion of the springf and permitsthe flow of the fluid from the outer space to the inner. When the pistonbegins to descend the valve D is quickly forced to its bearing, both bythe reaction of the spring f and p by the downward pressure of thefluid, so that only the predetermined area of opening is exposed for theescape of the latter.

The operation of the auxiliary valves G and H is as follows If, fromleakage orother causes, an excess of fluid shall accumulate in thevessel B. below the piston, the same will, by the descent of the piston,be forced through the valve G into the chamber above the ring 0, asshown in Fig. 2, and by the ascent of the piston through the valve Hinto the space between the vessel B and the receptacle A, as shown.

Some of the advantages of the described construction are as follows: Bymeans of the adjusting device the area of opening for the escape of thefluid may be regulated at will by the engineer whenever change isdesired. By means of the valves the dash-pot is adapted to adjust itselfautomatically to the changes that may occur in the quantity of thefluid.

Having thus fully described my invention,

what I claim as new, and desire to secure by Letters Patent, is

l. In combination with a receptacle, A, and a vessel, B, having avalve-opening in the lower part of the vessel, as described, a valve, D,and mechanism E, substantially as described, located below the valve,foradjusting the position of the valve to increase or diminish the area ofopening for the passage of the fluid, as set forth.

-2. In combination with the valve D, having the shank d the adjustingdevice having the frame portion and shank portion capable of verticalmovement, substantially as described.

3. In combination with the valve D, having the shank W, the sleeve F andspringffor giving the valve its downward movement.

4. In combination with the valve, the adjusting device E, having theframe portion 0, with base-piece 6 vertical arms cheap-piece 6 withprojection 6 and the shank portion,with screwthreads, as described.

5. In combination with the main valve D, the auxiliary valves G and H,substantially as and for the purpose described.

This specification signed and witnessed this 4th day of May, 1882.

H. S. HAYWARD.

Witnesses:

J. H. ELLIOTT, O. A. SGHANZE.

